By S. K. Sundaram
The 75th Glass challenge convention is equipped in keeping with the subsequent subject matters: Glass Melting, Forming, Energy and Environmental, Refractories, Sensors and regulate, Modeling
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Extra info for 75th Conference on Glass Problems : Ceramic Engineering and Science Proceedings, Volume 36, Issue 1
12 section machine). 75th Conference on Glass Problems · 45 Closed Loop Control of Glass Container Forming A comparison of open loop and closed loop PUC for multiple machine sections is shown in, Figure 11, which plots data for all three cavities of Section 7 through 12 (labels S7,S8… S12) of a twelve section triple gob (3 cavity) machine. Considerable variation in rise time is evident while in open loop (prior to cycle 1200). It can be seen that this variation is dramatically reduced once the closed loop control is switched on.
Incomplete travel of plunger resulting in unfilled finish Figure 4. Typical plunger motion profile 75th Conference on Glass Problems · 41 Closed Loop Control of Glass Container Forming Figure 5. Variation in plunger rise time, showing effect of swabbing Measurement System Obtaining a good measurement of the process to be controlled is a prerequisite for implementing a closed loop control system. For the case of the plunger up control system we have been able to utilize the Emhart PPC (Plunger Process Control) system to provide the necessary measurements as shown in Figure 6.
An illustrative view of the user interface for the plunger up control is shown in Figure 9. As shown, the desired (setpoint) value for the rise time can be set for each section and cavity of the machine. The user interface displays the setpoint value and actual value for each cavity. Individual control loops can also be turned on and off from this screen. Colors are changed in the display of the actual values to indicate control loops that are currently at their user-configured limits. Figure 9.
75th Conference on Glass Problems : Ceramic Engineering and Science Proceedings, Volume 36, Issue 1 by S. K. Sundaram